Phil Hartman of Blue Ridge Models once said, "Any given prop does the
best it can". I thought that this was more profound than it sounded, so
wrote it down, dated it, and walked over to give it to the INAV editor,
Plenny Bates for the newsletter.
I did not ask for an explanation, but guessed maybe he meant that some
part of the prop would be pitched correctly for some portion of the
flight even if other parts were not at that moment.
Fred Rash
On 3/16/2016 7:36 PM, William Gowen wdgowen_at_gmail.com
[Indoor_Construction] wrote:
> My FEELING is that having washed out tips on a VP prop will help to
> give some useful thrust when most of the prop is stalled out. The only
> model I fly this way is F1M. For low ceilings my starting high pitch
> has the blades almost parallel to the motor stick. For non-VP classes
> I don't know enough about aerodynamics to have an opinion.
>
> On Wed, Mar 16, 2016 at 7:15 PM, 'John Barker'
> john.barker783_at_ntlworld.com <mailto:john.barker783_at_ntlworld.com>
> [Indoor_Construction] <Indoor_Construction_at_yahoogroups.com
> <mailto:Indoor_Construction_at_yahoogroups.com>> wrote:
>
> Vladimir,
>
> Personally I have not seen any PROOF that any propeller works
> better with washout and I have studied any information on
> propeller design that came my way for as long as I can remember.
> Of course, since about the middle of last century, quite a few
> rubber duration flyers had the idea that if the tips were washed
> out and the model nosed up too steeply towards a stall then the
> tips would continue to give some thrust and lessen the severity of
> the stall. I think eventually that most flyers realised that
> careful trimming was a better solution.
>
> John Barker - England
>
> *From:*Indoor_Construction_at_yahoogroups.com
> <mailto:Indoor_Construction_at_yahoogroups.com>
> [mailto:Indoor_Construction_at_yahoogroups.com
> <mailto:Indoor_Construction_at_yahoogroups.com>]
> *Sent:* 16 March 2016 22:10
> *To:* Indoor_Construction_at_yahoogroups.com
> <mailto:Indoor_Construction_at_yahoogroups.com>
> *Subject:* [Indoor_Construction] Ama clases props
>
> Dear all,
> It has proven that in F1D props with washout eg dumping pitch in
> the last 30-40 percent of the prop does give a definite advantage.
> Has anyone experimented applying this to AMA clases like EZB, open
> and ltd pennyplane, manhattan, etc. any comparative data and
> flight/performance thoughts are well appreciated
> Vladimir Linardic
>
>
>
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Received on Wed Mar 16 2016 - 17:49:31 CET